ADL5330ACPZ-R2 datasheet(13/24 Pages) AD

13 / 24 page

ADL5330

Rev. A | Page 13 of 24

APPLICATIONS

BASIC CONNECTIONS

Figure 32 shows the basic connections for operating the

ADL5330. There are two positive supplies, VPS1 and VPS2,

which must be connected to the same potential. Both COM1

and COM2 (common pins) should be connected to a low

impedance ground plane.

A power supply voltage between 4.75 V and 5.25 V should be

applied to VPS1 and VPS2. Decoupling capacitors with 100 pF

and 0.1 μF power supplies should be connected close to each

power supply pin. The VPS2 pins (Pin 18 through Pin 22) can

share a pair of decoupling capacitors because of their proximity

to each other.

The outputs of the ADL5330, OPHI and OPLO, are open

collectors that need to be pulled up to the positive supply with

120 nH RF chokes. The ac-coupling capacitors and the RF

chokes are the principle limitations for operation at low

frequencies. For example, to operate down to 1 MHz, 0.1 μF ac-

coupling capacitors and 1.5 μH RF chokes should be used. Note

that in some circumstances, the use of substantially larger

inductor values results in oscillations.

Since the differential outputs are biased to the positive supply,

ac-coupling capacitors, preferably 100 pF, are needed between

the ADL5330 outputs and the next stage in the system.

Similarly, the INHI and INLO input pins are at bias voltages of

about 3.3 V above ground.

The nominal input and output impedance looking into each

individual RF input/output pin is 25 Ω. Consequently, the

differential impedance is 50 Ω.

To enable the ADL5330, the ENBL pin must be pulled high.

Taking ENBL low puts the ADL5330 in sleep mode, reducing

current consumption to 250 μA at ambient. The voltage on

ENBL must be greater than 1.7 V to enable the device. When

enabled, the device draws 100 mA at low gain to 215 mA at

maximum gain.

INHI

C13

100pF

C11

100pF

C12

0.1

μF

C10

1nF

INLO

COM1

VPS1

COM1

C14

100pF

OPHI

100pF

OPLO

COM2

VPS2

COM2

100pF

0.1

μF

0.1

μF

100pF

C16

100pF

C12

0.1

μF

VPOS

GAIN

RF INPUT

RF OUTPUT

VPOS

0.1

μF

100pF

VPOS

120nH

ADL5330

Figure 32. Basic Connections

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